Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 52.21 kDa 
• Atom Count: 4273 
• Modelled Residue Count: 442 
• Deposited Residue Count: 444 
• Unique protein chains: 1

1PL1

Crystal structure of human glutathione transferase (GST) A1-1 in complex with a decarboxy-glutathione

• PDB DOI: 10.2210/pdb1PL1/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2003-06-06 Released: 2004-06-22 
• Deposition Author(s): Grahn, E., Jakobsson, E., Gustafsson, A., Grehn, L., Olin, B., Wahlberg, M., Madsen, D., Kleywegt, G.J., Mannervik, B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.189 
• R-Value Work: 0.148 
• R-Value Observed: 0.152 

Literature

New crystal structures of human glutathione transferase A1-1 shed light on glutathione binding and the conformation of the C-terminal helix.

Grahn, E., Novotny, M., Jakobsson, E., Gustafsson, A., Grehn, L., Olin, B., Madsen, D., Wahlberg, M., Mannervik, B., Kleywegt, G.J.

(2006) Acta Crystallogr D Biol Crystallogr 62: 197-207

• PubMed: 16421451 
• DOI: 10.1107/S0907444905039296
• Primary Citation of Related Structures:  
  1PKW, 1PKZ, 1PL1, 1PL2, 1XWG


• PubMed Abstract: 
  

Human glutathione transferase A1-1 is a well studied enzyme, but despite a wealth of structural and biochemical data a number of aspects of its catalytic function are still poorly understood. Here, five new crystal structures of this enzyme are described that provide several insights. Firstly, the structure of a complex of the wild-type human enzyme with glutathione was determined for the first time at 2.0 angstroms resolution. This reveals that glutathione binds in the G site in a very similar fashion as the glutathione portion of substrate analogues in other structures and also that glutathione binding alone is sufficient to stabilize the C-terminal helix of the protein. Secondly, we have studied the complex with a decarboxylated glutathione conjugate that is known to dramatically decrease the activity of the enzyme. The T68E mutant of human glutathione transferase A1-1 recovers some of the activity that is lost with the decarboxylated glutathione, but our structures of this mutant show that none of the earlier explanations of this phenomenon are likely to be correct. Thirdly, and serendipitously, the apo structures also reveal the conformation of the crucial C-terminal region that is disordered in all previous apo structures. The C-terminal region can adopt an ordered helix-like structure even in the apo state, but shows a strong tendency to unwind. Different conformations of the C-terminal regions were observed in the apo states of the two monomers, which suggests that cooperativity could play a role in the activity of the enzyme.

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Organizational Affiliation: 

Department of Cell and Molecular Biology, Uppsala University, Biomedical Centre, Box 596, SE-751 24 Uppsala, Sweden.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Glutathione S-transferase A1	A, B	222	Homo sapiens	Mutation(s): 1  Gene Names: GSTA1 EC: 2.5.1.18 (PDB Primary Data), 1.11.1 (UniProt), 5.3.3 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P08263 (Homo sapiens) Explore P08263  Go to UniProtKB:  P08263
PHAROS:  P08263

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ABY	D [auth A], F [auth B]	N-(4-AMINOBUTANOYL)-S-(4-METHOXYBENZYL)-L-CYSTEINYLGLYCINE C17 H25 N3 O5 S OMOPDEZZBQHMGS-AWEZNQCLSA-N
CL	C [auth A], E [auth B]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSO	A, B	L-PEPTIDE LINKING	C3 H7 N O3 S		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Free: 0.189 
• R-Value Work: 0.148 
• R-Value Observed: 0.152 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 99.505	α = 90
b = 90.247	β = 93.67
c = 51.13	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-06-06 
• Released Date: 2004-06-22 
Deposition Author(s): Grahn, E., Jakobsson, E., Gustafsson, A., Grehn, L., Olin, B., Wahlberg, M., Madsen, D., Kleywegt, G.J., Mannervik, B.

Revision History  

• Version 1.0: 2004-06-22
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-03-07
  Changes: Data collection